"Although much has changed here over time, the commitment to the legacy of guiding and to the protection and perpetuation of our ancestral beliefs, art forms and traditions has remained constant," he said.
"We are proud of our legacy of manaaki (hospitality) and we remain committed to caring for our unique physical and cultural environment."
Mr Cossar said Te Puia and the Institute remained a local, tribal, national and international icon and the 50-year milestone was an opportunity to reflect upon its achievements and legacy.
"We have a lot to celebrate. Our people have welcomed and guided visitors through Te Whakarewarewa for more than 170 years and have acted as kaitiaki (guardians) since long before that.
"Our 50-year celebration events have been developed as an invitation to New Zealanders to revisit our iconic valley, to relive what may be childhood memories and to create new ones for the future. At the same time, these events add a whole new experience to our international manuhuri as they will be part of something very special."
Leading up to the milestone, visitors will also be able to watch the replicated carving of a historic waharoa (entranceway). Other restoration and carving work will also be undertaken , including at the Te Aronui a Rua wharenui (sacred meeting house) and its pataka - a richly carved storehouse used to store the taonga (treasures) of chiefs.